<html lang="en">
<head>
    <title>Test</title>

    <style>
        html {
            /*background-color: #00221f;*/
            color: #00ff00;
        }
        h1 {
            background-color: aqua;
            color: #0000ff;
        }
        div {
            background-color: firebrick;
            color: #ffff00;
        }
        .red {
            background-color: lime;
            color: #ff0000;
        }
    </style>
</head>
<body>
    <h1>[This is blue]</h1>
    <p class="red">[This is red]</p>

    <div>[This is yellow]  <p>[And this is yellow too]</p></div>
    [This is default color]

    <div class="red">[Red again]</div>

    <script>alert("hello world!");</script>

    [Default again]
</body>
</html>